CVE-2026-18963: Keycloak: Unauthenticated account takeover via reset-credentials flow bypass
A flaw was found in the reset-credentials flow of the keycloak-services component, which is the core engine for identity and access management in Red Hat Build of Keycloak. The issue allows an unauthenticated attacker to force the password reset process for any user without needing to click the required email verification link.
Published Aug 18, 2026 · Updated Aug 28, 2026
Affected packages
org.keycloak:keycloak-services
- Ecosystem
- Maven
- Affected
- >= 26.0.0, < 26.4.15
- Fixed in
- 26.4.15
- Check
mvn dependency:tree -Dincludes=org.keycloak:keycloak-services
org.keycloak:keycloak-services
- Ecosystem
- Maven
- Affected
- >= 26.5.0, < 26.6.6
- Fixed in
- 26.6.6
- Check
mvn dependency:tree -Dincludes=org.keycloak:keycloak-services
org.keycloak:keycloak-services
- Ecosystem
- Maven
- Affected
- >= 26.7.0, < 26.7.2
- Fixed in
- 26.7.2
- Check
mvn dependency:tree -Dincludes=org.keycloak:keycloak-services
Advisory details
From the GitHub Advisory Database (CC BY 4.0).
A flaw was found in the reset-credentials flow of the keycloak-services component, which is the core engine for identity and access management in Red Hat Build of Keycloak. The issue allows an unauthenticated attacker to force the password reset process for any user without needing to click the required email verification link. This can result in the attacker gaining full control over target user accounts by directly setting new credentials.
Credited to madmuffin1, greiffmode, pv-rudger.
References
- https://nvd.nist.gov/vuln/detail/CVE-2026-18963
- https://access.redhat.com/security/cve/CVE-2026-18963
- https://bugzilla.redhat.com/show_bug.cgi?id=2511595
- https://access.redhat.com/errata/RHSA-2026:56519
- https://access.redhat.com/errata/RHSA-2026:56523
- https://access.redhat.com/errata/RHSA-2026:56524
- https://access.redhat.com/errata/RHSA-2026:56520
- https://github.com/keycloak/keycloak/issues/51833
- https://github.com/keycloak/keycloak/pull/51844
- https://github.com/keycloak/keycloak/commit/dc2d4e524b4dae85aedc87ca28b9e4fa567d56c1
- https://github.com/advisories/GHSA-4gv3-mc9p-5wqc
How this page is made: the data panel comes from the GitHub Advisory Database, CISA’s KEV catalog, the NVD and FIRST EPSS, and updates twice a day. No analysis has been written for this entry yet. Methodology